CVE-2026-66322

HIGHNVD 5.47.1▲
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-04. NVD baseline CVSS 5.4; sources differ by 1.7.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.

CVSS v3
5.4
EG Score
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

August 3, 2026

Last Modified

August 20, 2026

Advisory Details (1)

Auto-updated Aug 3, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66322

Vendor Advisories for CVE-2026-66322(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 49× in last 7d / 121× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 121 total refreshes for this CVE.

  1. 2026-08-21 05:04 UTCEG score recompute
  2. 2026-08-21 05:04 UTCVendor advisory
  3. 2026-08-21 05:04 UTCGHSA enrichment
  4. 2026-08-20 22:56 UTCEPSS rescore
  5. 2026-08-20 17:17 UTCVendor advisory
  6. 2026-08-20 17:17 UTCGHSA enrichment
  7. 2026-08-20 16:50 UTCVendor advisory
  8. 2026-08-20 16:50 UTCGHSA enrichment
  9. 2026-08-20 04:44 UTCEG score recompute
  10. 2026-08-20 04:44 UTCGHSA enrichment
  11. 2026-08-19 17:04 UTCEPSS rescore
  12. 2026-08-19 16:57 UTCVendor advisory
  13. 2026-08-19 16:57 UTCGHSA enrichment
  14. 2026-08-19 16:04 UTCVendor advisory
  15. 2026-08-19 16:03 UTCGHSA enrichment
  16. 2026-08-19 05:20 UTCVendor advisory
  17. 2026-08-19 05:20 UTCGHSA enrichment
  18. 2026-08-18 17:33 UTCVendor advisory
  19. 2026-08-18 17:33 UTCGHSA enrichment
  20. 2026-08-18 16:14 UTCVendor advisory
  21. 2026-08-18 16:14 UTCGHSA enrichment
  22. 2026-08-18 06:13 UTCGHSA enrichment
  23. 2026-08-17 18:25 UTCVendor advisory
  24. 2026-08-17 18:24 UTCGHSA enrichment
  25. 2026-08-17 16:32 UTCEG score recompute
Show 75 more
  1. 2026-08-17 16:32 UTCVendor advisory
  2. 2026-08-17 16:32 UTCGHSA enrichment
  3. 2026-08-17 13:47 UTCEPSS rescore
  4. 2026-08-17 04:28 UTCVendor advisory
  5. 2026-08-17 04:28 UTCGHSA enrichment
  6. 2026-08-16 16:41 UTCEG score recompute
  7. 2026-08-16 16:41 UTCVendor advisory
  8. 2026-08-16 16:41 UTCGHSA enrichment
  9. 2026-08-16 14:56 UTCEPSS rescore
  10. 2026-08-16 04:55 UTCEG score recompute
  11. 2026-08-16 04:55 UTCVendor advisory
  12. 2026-08-16 04:55 UTCGHSA enrichment
  13. 2026-08-15 17:09 UTCVendor advisory
  14. 2026-08-15 17:09 UTCGHSA enrichment
  15. 2026-08-15 05:23 UTCEG score recompute
  16. 2026-08-15 05:23 UTCVendor advisory
  17. 2026-08-15 05:23 UTCGHSA enrichment
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-14 17:36 UTCVendor advisory
  20. 2026-08-14 17:36 UTCGHSA enrichment
  21. 2026-08-14 17:11 UTCVendor advisory
  22. 2026-08-14 17:11 UTCGHSA enrichment
  23. 2026-08-14 15:46 UTCVendor advisory
  24. 2026-08-14 15:46 UTCGHSA enrichment
  25. 2026-08-14 03:59 UTCEG score recompute
  26. 2026-08-14 03:59 UTCVendor advisory
  27. 2026-08-14 03:59 UTCGHSA enrichment
  28. 2026-08-13 22:00 UTCEPSS rescore
  29. 2026-08-13 16:13 UTCVendor advisory
  30. 2026-08-13 16:13 UTCGHSA enrichment
  31. 2026-08-13 04:26 UTCGHSA enrichment
  32. 2026-08-12 16:40 UTCEG score recompute
  33. 2026-08-12 16:40 UTCVendor advisory
  34. 2026-08-12 16:40 UTCGHSA enrichment
  35. 2026-08-12 13:51 UTCEPSS rescore
  36. 2026-08-12 04:54 UTCVendor advisory
  37. 2026-08-12 04:54 UTCGHSA enrichment
  38. 2026-08-11 17:08 UTCEG score recompute
  39. 2026-08-11 17:08 UTCVendor advisory
  40. 2026-08-11 17:08 UTCGHSA enrichment
  41. 2026-08-11 05:21 UTCEG score recompute
  42. 2026-08-11 05:21 UTCVendor advisory
  43. 2026-08-11 05:21 UTCGHSA enrichment
  44. 2026-08-11 00:00 UTCEPSS rescore
  45. 2026-08-10 17:35 UTCGHSA enrichment
  46. 2026-08-10 17:07 UTCGHSA enrichment
  47. 2026-08-10 05:20 UTCGHSA enrichment
  48. 2026-08-09 17:34 UTCEG score recompute
  49. 2026-08-09 17:34 UTCGHSA enrichment
  50. 2026-08-09 13:47 UTCEPSS rescore
  51. 2026-08-09 05:48 UTCGHSA enrichment
  52. 2026-08-08 18:02 UTCEG score recompute
  53. 2026-08-08 18:02 UTCVendor advisory
  54. 2026-08-08 18:02 UTCGHSA enrichment
  55. 2026-08-08 16:37 UTCEPSS rescore
  56. 2026-08-08 06:15 UTCGHSA enrichment
  57. 2026-08-07 18:29 UTCEG score recompute
  58. 2026-08-07 18:29 UTCVendor advisory
  59. 2026-08-07 18:29 UTCGHSA enrichment
  60. 2026-08-07 10:11 UTCVendor advisory
  61. 2026-08-07 10:11 UTCGHSA enrichment
  62. 2026-08-06 22:25 UTCVendor advisory
  63. 2026-08-06 22:24 UTCGHSA enrichment
  64. 2026-08-06 17:16 UTCEG score recompute
  65. 2026-08-06 17:16 UTCVendor advisory
  66. 2026-08-06 17:16 UTCGHSA enrichment
  67. 2026-08-06 17:15 UTCNVD updateCVSS v3 → 5.4 · severity → MEDIUM
  68. 2026-08-06 15:50 UTCVendor advisory
  69. 2026-08-06 15:50 UTCGHSA enrichment
  70. 2026-08-06 14:29 UTCEG score recompute
  71. 2026-08-06 14:29 UTCVendor advisory
  72. 2026-08-06 14:29 UTCGHSA enrichment
  73. 2026-08-06 13:47 UTCEPSS rescore
  74. 2026-08-06 02:41 UTCEG score recompute
  75. 2026-08-06 02:41 UTCVendor advisory

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-66322?
CVE-2026-66322 is a high vulnerability published on August 3, 2026. Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.
When was CVE-2026-66322 disclosed?
CVE-2026-66322 was first published in the National Vulnerability Database on August 3, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66322 actively exploited?
CVE-2026-66322 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 86.4% of all scored CVEs.
What is the CVSS score of CVE-2026-66322?
CVE-2026-66322 has a CVSS v3 base score of 5.4 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.1.
How do I remediate CVE-2026-66322?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66322, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-66322

Explore →

Is Your Infrastructure Affected by CVE-2026-66322?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs